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Old 09-23-2014, 08:09 AM   #1
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redo foundation with structure on top


I have a garage approx. 30X50ft. used to park 3 cars. Now in disrepair. The garage is on a slab, or dirt, with no foundation right now.

I need to add a foundation to it, a foundation that will support 3 storeys in the near future.

Problem is that I cannot take the garage down to do the foundation. I have to keep at least 50% of the structure at any time or I lose my right to build.

How do I keep the half structure while digging and adding foundation?

I have seen houses sorta lifted up while adding or repairing foundation. The garage does not have a proper floor that I can lift on tho. ...

Thanks
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Old 09-23-2014, 11:29 AM   #2
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Does it have trusses or ceiling joists? Build a support wall 2 feet inside the existing wall to support the roof. The wall will hang in mid air. Dig under the wall and install new foundation. Do one wall at a time.

Or do the support wall thing and do each corner 5-6 feet in each direction. Then do the wall sections in between using the corners to support the structure.
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Old 09-23-2014, 11:32 AM   #3
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I understand this is a DIY forum but you need to hire a pro to do this.Probably an engineer too.Especially if you need to get permits.Not familiar with the codes in Canada.
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Old 10-03-2014, 09:54 PM   #4
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Quote:
Originally Posted by joed View Post
Does it have trusses or ceiling joists? Build a support wall 2 feet inside the existing wall to support the roof. The wall will hang in mid air. Dig under the wall and install new foundation. Do one wall at a time.

Or do the support wall thing and do each corner 5-6 feet in each direction. Then do the wall sections in between using the corners to support the structure.
So,I will pour foundation one section at a time, and use rebar to connect them?

Thanks!
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Old 10-04-2014, 07:18 AM   #5
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So,I will pour foundation one section at a time, and use rebar to connect them?

Thanks!
That is the basic idea, yes.
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Old 10-04-2014, 07:22 AM   #6
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Opening up a whole can of worms by wanting to add two more story's.
Need an engineer to come up with some plans and drawings.
Just going to end up with a weak foundation trying to do this in sections.
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Old 10-10-2014, 10:26 AM   #7
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Quote:
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Opening up a whole can of worms by wanting to add two more story's.
Need an engineer to come up with some plans and drawings.
Just going to end up with a weak foundation trying to do this in sections.
Hi, joe captain,

Yes, i understand that it needs engineering. Im just trying to plan for the physical work. I'm very shy in paying the foundation guys 10-20k a week, and for unknown no.of weeks... this seems to be the universal quotes here for foundation work.

Thus I'm planning on driving the back holes myself...
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Old 10-10-2014, 05:48 PM   #8
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If it is engineered properly supports can installed inside the structure to allow the entire foundation to replaced at once.
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Old 10-11-2014, 07:53 PM   #9
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yep that's the way. real pros will suport entire structure and may even lift a bit while they install entire monolithic slab according to engineered plan. i'm a crazy DIY'er doing projects most wouldn't. i wouldn't touch this one.
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Old 10-12-2014, 07:47 AM   #10
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This one should be rather simple to support. If I remember this is only a light garage.
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